Abstract Aerodynamicists use wind tunnel to test models as well as for proposed aircraft components and engines. In order to keep these models fixed in place for testing, ground based equipment is essential. Electrohydraulic drives form the back bone of such type of mechanism which requires continuous motion for life time operations with controlled motion for start stop and bi-directional motion mechanisms. Focus of this paper is on systematic approach for optimal designing of a typical electrohydraulic drive that will provide roll motion to the testing model with emphasis on reliability of the system. This paper further highlights the design, selection, testing and qualification procedures of different elements of the drive and the electrohydraulic drive assembly as a whole. Keywords - Design, Develop, Electrohydraulic roll drive, Spindle.
Design and fabrication of prototype of multipurpose machine for sheet metal o...eSAT Journals
Abstract Sheet metal is basically a thin sheet of metal by using several operations. Nowadays it has become one of the most
important and fundamental forms in metalworking.[10] the advantage of sheet metal is that it can be bent into variety of
desired shapes. Lots of everyday objects are being manufactured using sheet metal. Sheet metal is mainly used for various
aerodynamically shaped car bodies, airplane wings, architecture and many other applications.[9] dent removing/rolling, cutting
and v-grooving are the most widely used operations in the fabrication industry. The conventional machines could only carry out
any of the above operations simultaneously. If these operations can be done on a single machine, it would not only make work quite
easy and less tedious but also increases profitability .moreover, conventional machines are often hand operated for small scale industry
applications. Also the time taken on these separate machines that is the overall lead time decreases by making them power
operated, resulting in lower cost and higher productivity. Our project is to encompass these operations onto a single machine
successfully. Keywords: Sheet Metal, Rolling, Cutting, V-Grooving
DESIGN AND ANALYSIS OF ELECTRO HYDRAULIC THRUSTER BRAKE FOR LIFTING MACHINEijiert bestjournal
Brakes are very important part of most important pa rt of the crane. Failure of brakes is often associated with the sudden and massive failure. In the recent era disc brakes for a crane has become very important. And incorporating disc often asks greater efficiency and exact position stop when we apply disc brake. The power of disc br ake is very higher than of conventional drum brakes. If the liner wear and tear is less and if auto adjustment is provided to disc brakes,it gives an advantage of less maintenance as well grea ter safety to machine and operator.
Design and fabrication of prototype of multipurpose machine for sheet metal o...eSAT Journals
Abstract Sheet metal is basically a thin sheet of metal by using several operations. Nowadays it has become one of the most
important and fundamental forms in metalworking.[10] the advantage of sheet metal is that it can be bent into variety of
desired shapes. Lots of everyday objects are being manufactured using sheet metal. Sheet metal is mainly used for various
aerodynamically shaped car bodies, airplane wings, architecture and many other applications.[9] dent removing/rolling, cutting
and v-grooving are the most widely used operations in the fabrication industry. The conventional machines could only carry out
any of the above operations simultaneously. If these operations can be done on a single machine, it would not only make work quite
easy and less tedious but also increases profitability .moreover, conventional machines are often hand operated for small scale industry
applications. Also the time taken on these separate machines that is the overall lead time decreases by making them power
operated, resulting in lower cost and higher productivity. Our project is to encompass these operations onto a single machine
successfully. Keywords: Sheet Metal, Rolling, Cutting, V-Grooving
DESIGN AND ANALYSIS OF ELECTRO HYDRAULIC THRUSTER BRAKE FOR LIFTING MACHINEijiert bestjournal
Brakes are very important part of most important pa rt of the crane. Failure of brakes is often associated with the sudden and massive failure. In the recent era disc brakes for a crane has become very important. And incorporating disc often asks greater efficiency and exact position stop when we apply disc brake. The power of disc br ake is very higher than of conventional drum brakes. If the liner wear and tear is less and if auto adjustment is provided to disc brakes,it gives an advantage of less maintenance as well grea ter safety to machine and operator.
This thesis deal with design development and fabrication of “MULTI PURPOSE MECHANICAL MACHINE”. This machine is designed for the purpose of MULTI-OPERATIONs i.e. BLANKING, CUTTING, SHAPING, HAMMERING & GRINDING. This machine perform multipurpose operation at same time with required speed & this machine is automatic which is controlled or operated by motor which is run with the help of current. This machine is based on the mechanism of whit worth return. This model of the multi operational machine is may be used in industries and domestic operation which can perform mechanical operation like drilling, cutting & shaping of a thin metallic as well as wooden model or body
This project is done by the mechanical diploma engineering student of tssm's bscoer poly., pune
design and development of multipurpose mechanical machine
last year project-2017-18
it is the best project for the engineering student for the last year by modification as per the need
Design and analysis of drive shaft for heavy duty truckeSAT Journals
Abstract
Drive shafts in commercial heavy duty vehicle are subjected to cyclic loads due to variation in the torque demanded by the
varying road loads. Cases of failure of the drive shaft of heavy duty trucks have been reported, which provides an opportunity to
investigate the issue.
In this project an attempt has been made on prediction of fatigue life of the drive shaft using FEA technique. The load spectrum
acting on the drive shaft is calculated for specified terrain. Structural analysis was carried out on the FE model of drive shaft, and
potential areas of high stress concentration are obtained. Von Mises stress, fatigue damage, fatigue life, factor of safety and total
deformation are the results of fatigue analysis.
It was observed that from the static analysis that the roots of the splines are the areas of high stress concentration. The fatigue
analysis revels that the drive shaft fails in the region of high stress concentration as expected. The fatigue life of the component is
found to be infinite for design pay load. The life of the drive shaft for 40% and 50% over load is 69806 kilometers and 20564
kilometers respectively. The present work can be used in automobile industry as a reference for predicting life of any component,
in the drive line of the automobile subjected to non constant amplitude loading.
Keywords: Fatigue, Cumulative Damage, Stress-life, Duty cycle, Numerical Fatigue Analysis, Palmgren-Miner Linear
damage rule, Rain-flow cycle counting.
Automation of Fixtures Using Hydraulic Power Pack for a Bogie UnderframeIOSR Journals
In this era of automation technologies manufacturing sectors have placed very high demands on fast and reliable production methods. This work is the evaluation & analysis of the existing clamping system. The current system uses manual clamping of fixtures for holding the work piece in the proper position while welding process is being done on the part. The evaluated system uses hydraulic vertical swing clamps for holding the work piece driven by hydraulic power pack. Thus the new system achieves automatic and simultaneous clamping of fixtures.
Design, Development and Operation of 3.5HP Power Tillerpaperpublications3
Abstract: A power tiller is a mechanized agricultural implement popularly used to save time, human efforts and fuel in preparation of soil bed. In this paper presents the design and fabrication of maintenance free and efficient 3.5HP lightweight power tiller. However, under complex abrasive environment, tiller blades are subjected to extreme surface wear, particularly in dry sand which considerably affects its service life. Our aim of this paper is to improve service life of the tiller blade. Working of transmission system is based on chain sprocket mechanism to reduce cost. Different component of machine are modeled by using modeling software CATIA V5R21. The developed model is useful for agricultural industry especially developing countries.
Optimization of design of mixed flow centrifugal pump impeller using cfdeSAT Journals
Abstract
Centrifugal pumps are widely used hydraulic machines, irrespective of the fact that their performance is generally not very good. So, turning them into more efficient machines is quite a challenge. The performance of a centrifugal pump is highly dependent on its geometrical parameters and its vane profile. In order to analyze the flow through complex systems like centrifugal pumps, Computation fluid dynamics (CFD) has been used. This work aims to study the performance analysis of a centrifugal mixed flow pump designed to deliver 0.25 m3/s of water with a head of 20 m at a speed of 1450 rpm using ANSYS CFX (ver.14.0). PTC Creo (ver. 2.0) has been used to model the pump unit. The performance of the pump was first determined using the existing vane angles and thickness of the blade then, the inlet vane angle, the outlet vane angle along with the thickness of the blade has been varied to analyze the pump’s performance . The results show that for an initial inlet angle 21.08˚, outlet angle 16.28˚ and blade thickness as 10mm, the efficiency of the pump was 84%. However, the efficiency of pump rises to 89.19% for the optimized angles and blade thickness.
Design and fabrication of multi way hacksaw machine REPORT Eshver chandra
In this project work and effort has been made to develop a modernized multi way hacksaw machine and less stress full operation for cutting wood, metal and plastic materials. The aim of this work is to develop a hacksaw machine that will use a less effort to produce uniform cutting of PVC pipes, metals, wood. It is also done to show the performance difference between hand driven, pedal drive and multi way hacksaw machine. This model implies a conversion of rotary motion of swashplate to reciprocating motion of hacksaw blades, which is done by using Wobble Plate Mechanism. This motion is used for hacksaw machine; in this model we can operate multi hacksaws simultaneously. This model will overcome the traditional hacksaw machine which done material cutting of single piece at particular times interval and also fulfils the need of more material cutting accounts to mass production. This machine works significantly with minimum vibrations and jerks. Hence the purposed model of hacksaw machines will be welcomed by many industries due to compactness and efficiency. To achieve this goal the multi way hacksaw machine is developed.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Fea analysis and optimization of an one way clutch used in automatic transmis...eSAT Journals
Abstract An intent of this project is to reduce the weight of one way clutch which is being used in automotive transmission enabled sports cars. By reducing the weight we can achieve better efficiency in terms of strength and also to increase the transmission power from torque converter wherein which engaging and disengaging happens. One way roller clutch is one, when the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the rollers lock between outer cage (cam) and inner cage, producing a wedging action and binding because of friction. The rollers are spring-loaded. Design parameters like maximum torsional deflection, minimum hoop`s stress are considered for to get increased efficiency. In order to achieve this FEA analysis and optimization technique is carried here. Optimization is the mathematical discipline which is concerned with finding the maxima and minima of functions, possibly subject to constraints. Here optimization is carried out by using the global parameters optimization technique. Keywords: FEA analysis, Global parameters, Minimum hoop`s stress, Weight
Esign and fabrication of a shearing machine for glass fiber sleeves using ste...eSAT Journals
Abstract
This paper gives the reader an insight in to the work we went through to invent the concept for an automated fiber glass sleeve cutting machine. The challenge given to us by the Industry was to design and fabricate the shearing machine that can cut fiber glass sleeves in a given desired length automatically on a large scale. The length of the sleeve given to us is in range of 20mm-50mm. We set out to invent a simple but strong concept resulting in a machine with minimal complexity which will reduce the cost of production, time required to cut the sleeve and also improve the ease of maintenance. This paper is testament to how we achieved a supposedly complex automation using simple mechanical automation. To support our concept we also set out to fabricate a proposed machine to prove this concept will work.
Keywords: Shearing, Plc, Fiber glass sleeves, Ladder programming, Hmi
This thesis deal with design development and fabrication of “MULTI PURPOSE MECHANICAL MACHINE”. This machine is designed for the purpose of MULTI-OPERATIONs i.e. BLANKING, CUTTING, SHAPING, HAMMERING & GRINDING. This machine perform multipurpose operation at same time with required speed & this machine is automatic which is controlled or operated by motor which is run with the help of current. This machine is based on the mechanism of whit worth return. This model of the multi operational machine is may be used in industries and domestic operation which can perform mechanical operation like drilling, cutting & shaping of a thin metallic as well as wooden model or body
This project is done by the mechanical diploma engineering student of tssm's bscoer poly., pune
design and development of multipurpose mechanical machine
last year project-2017-18
it is the best project for the engineering student for the last year by modification as per the need
Design and analysis of drive shaft for heavy duty truckeSAT Journals
Abstract
Drive shafts in commercial heavy duty vehicle are subjected to cyclic loads due to variation in the torque demanded by the
varying road loads. Cases of failure of the drive shaft of heavy duty trucks have been reported, which provides an opportunity to
investigate the issue.
In this project an attempt has been made on prediction of fatigue life of the drive shaft using FEA technique. The load spectrum
acting on the drive shaft is calculated for specified terrain. Structural analysis was carried out on the FE model of drive shaft, and
potential areas of high stress concentration are obtained. Von Mises stress, fatigue damage, fatigue life, factor of safety and total
deformation are the results of fatigue analysis.
It was observed that from the static analysis that the roots of the splines are the areas of high stress concentration. The fatigue
analysis revels that the drive shaft fails in the region of high stress concentration as expected. The fatigue life of the component is
found to be infinite for design pay load. The life of the drive shaft for 40% and 50% over load is 69806 kilometers and 20564
kilometers respectively. The present work can be used in automobile industry as a reference for predicting life of any component,
in the drive line of the automobile subjected to non constant amplitude loading.
Keywords: Fatigue, Cumulative Damage, Stress-life, Duty cycle, Numerical Fatigue Analysis, Palmgren-Miner Linear
damage rule, Rain-flow cycle counting.
Automation of Fixtures Using Hydraulic Power Pack for a Bogie UnderframeIOSR Journals
In this era of automation technologies manufacturing sectors have placed very high demands on fast and reliable production methods. This work is the evaluation & analysis of the existing clamping system. The current system uses manual clamping of fixtures for holding the work piece in the proper position while welding process is being done on the part. The evaluated system uses hydraulic vertical swing clamps for holding the work piece driven by hydraulic power pack. Thus the new system achieves automatic and simultaneous clamping of fixtures.
Design, Development and Operation of 3.5HP Power Tillerpaperpublications3
Abstract: A power tiller is a mechanized agricultural implement popularly used to save time, human efforts and fuel in preparation of soil bed. In this paper presents the design and fabrication of maintenance free and efficient 3.5HP lightweight power tiller. However, under complex abrasive environment, tiller blades are subjected to extreme surface wear, particularly in dry sand which considerably affects its service life. Our aim of this paper is to improve service life of the tiller blade. Working of transmission system is based on chain sprocket mechanism to reduce cost. Different component of machine are modeled by using modeling software CATIA V5R21. The developed model is useful for agricultural industry especially developing countries.
Optimization of design of mixed flow centrifugal pump impeller using cfdeSAT Journals
Abstract
Centrifugal pumps are widely used hydraulic machines, irrespective of the fact that their performance is generally not very good. So, turning them into more efficient machines is quite a challenge. The performance of a centrifugal pump is highly dependent on its geometrical parameters and its vane profile. In order to analyze the flow through complex systems like centrifugal pumps, Computation fluid dynamics (CFD) has been used. This work aims to study the performance analysis of a centrifugal mixed flow pump designed to deliver 0.25 m3/s of water with a head of 20 m at a speed of 1450 rpm using ANSYS CFX (ver.14.0). PTC Creo (ver. 2.0) has been used to model the pump unit. The performance of the pump was first determined using the existing vane angles and thickness of the blade then, the inlet vane angle, the outlet vane angle along with the thickness of the blade has been varied to analyze the pump’s performance . The results show that for an initial inlet angle 21.08˚, outlet angle 16.28˚ and blade thickness as 10mm, the efficiency of the pump was 84%. However, the efficiency of pump rises to 89.19% for the optimized angles and blade thickness.
Design and fabrication of multi way hacksaw machine REPORT Eshver chandra
In this project work and effort has been made to develop a modernized multi way hacksaw machine and less stress full operation for cutting wood, metal and plastic materials. The aim of this work is to develop a hacksaw machine that will use a less effort to produce uniform cutting of PVC pipes, metals, wood. It is also done to show the performance difference between hand driven, pedal drive and multi way hacksaw machine. This model implies a conversion of rotary motion of swashplate to reciprocating motion of hacksaw blades, which is done by using Wobble Plate Mechanism. This motion is used for hacksaw machine; in this model we can operate multi hacksaws simultaneously. This model will overcome the traditional hacksaw machine which done material cutting of single piece at particular times interval and also fulfils the need of more material cutting accounts to mass production. This machine works significantly with minimum vibrations and jerks. Hence the purposed model of hacksaw machines will be welcomed by many industries due to compactness and efficiency. To achieve this goal the multi way hacksaw machine is developed.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Fea analysis and optimization of an one way clutch used in automatic transmis...eSAT Journals
Abstract An intent of this project is to reduce the weight of one way clutch which is being used in automotive transmission enabled sports cars. By reducing the weight we can achieve better efficiency in terms of strength and also to increase the transmission power from torque converter wherein which engaging and disengaging happens. One way roller clutch is one, when the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the rollers lock between outer cage (cam) and inner cage, producing a wedging action and binding because of friction. The rollers are spring-loaded. Design parameters like maximum torsional deflection, minimum hoop`s stress are considered for to get increased efficiency. In order to achieve this FEA analysis and optimization technique is carried here. Optimization is the mathematical discipline which is concerned with finding the maxima and minima of functions, possibly subject to constraints. Here optimization is carried out by using the global parameters optimization technique. Keywords: FEA analysis, Global parameters, Minimum hoop`s stress, Weight
Esign and fabrication of a shearing machine for glass fiber sleeves using ste...eSAT Journals
Abstract
This paper gives the reader an insight in to the work we went through to invent the concept for an automated fiber glass sleeve cutting machine. The challenge given to us by the Industry was to design and fabricate the shearing machine that can cut fiber glass sleeves in a given desired length automatically on a large scale. The length of the sleeve given to us is in range of 20mm-50mm. We set out to invent a simple but strong concept resulting in a machine with minimal complexity which will reduce the cost of production, time required to cut the sleeve and also improve the ease of maintenance. This paper is testament to how we achieved a supposedly complex automation using simple mechanical automation. To support our concept we also set out to fabricate a proposed machine to prove this concept will work.
Keywords: Shearing, Plc, Fiber glass sleeves, Ladder programming, Hmi
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Design evaluation and optimization of steering yoke of an automobileeSAT Journals
Abstract The purpose of a steering system is to control the direction of the vehicle by operating the steering wheel of the steering system. The steering columns in a steering system are one of the main devices of an automobile. It is a very important part to attain stability and steady movement of the vehicle. The steering yoke consists of two forged-steel yokes or forks joined to the two shafts being coupled and situated at right angles to each other. A spider hinges these two yokes together. Since the arms of the spider are at right angles the spider arm rocks backwards and forward between four extreme positions. Motion transmission system of vehicles consist several components which sometimes encounter unfortunate failures. Some common reasons for the failures may be manufacturing, design faults, maintenance faults, raw material faults, material processing faults as well as the user originated faults. In this paper structural optimization of the steering yoke is carried out. For modeling of the component, CATIA V5 R17 software is used. It has been found that there are essentially in two stages of the design process that structural optimization can be applied. In the early stage of concept generation, topology optimization should be used to develop an efficient structure from the beginning. At this level an automatized variation of optimization parameters was proven useful to and the best feasible design possible. In the later stage, shape and size optimization should be used to fine-tune the structure realized from the topology optimization and carried out physical experimentation to validate the model. Keywords: Steering Yoke, Structural optimization, CATIA V5, Hyperworks
The study on effect of torque on piston lateral motion eSAT Journals
Abstract The studies of engine components reveal the cause for the engine vibration and noise. The piston slap due to the impact of the piston in the walls of the cylinder is considered as one of the predominant source of engine noise. In the present work engine performance characteristics are considered. The variation of the torque from minimum to maximum and the corresponding values of the engine performance parameters are logged. The effect of torque on engine speed and on piston movement is studied. The duration of the piston in cylinder for these input values ore also logged. The piston lateral movement is recorded by measuring the gap between cylinder inner wall and the piston skirt for the piston primary motion from TDC to BDC and vice versa. Finite element analysis is carried for von-Mises stress and x-directional displacement for the lateral displacement. The high stress region in the piston is emphasized for the study. It is found that near TDC region the engine is experiencing the maximum impact due to high torque which is the result of combustion pressure and also corresponds to the cause for piston lateral motion in this region. Index Terms: engine torque, finite element analysis, lateral motion, and stress
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Similar to Design procedure of an electrohydraulic drive (20)
Mechanical properties of hybrid fiber reinforced concrete for pavementseSAT Journals
Abstract
The effect of addition of mono fibers and hybrid fibers on the mechanical properties of concrete mixture is studied in the present
investigation. Steel fibers of 1% and polypropylene fibers 0.036% were added individually to the concrete mixture as mono fibers and
then they were added together to form a hybrid fiber reinforced concrete. Mechanical properties such as compressive, split tensile and
flexural strength were determined. The results show that hybrid fibers improve the compressive strength marginally as compared to
mono fibers. Whereas, hybridization improves split tensile strength and flexural strength noticeably.
Keywords:-Hybridization, mono fibers, steel fiber, polypropylene fiber, Improvement in mechanical properties.
Material management in construction – a case studyeSAT Journals
Abstract
The objective of the present study is to understand about all the problems occurring in the company because of improper application
of material management. In construction project operation, often there is a project cost variance in terms of the material, equipments,
manpower, subcontractor, overhead cost, and general condition. Material is the main component in construction projects. Therefore,
if the material management is not properly managed it will create a project cost variance. Project cost can be controlled by taking
corrective actions towards the cost variance. Therefore a methodology is used to diagnose and evaluate the procurement process
involved in material management and launch a continuous improvement was developed and applied. A thorough study was carried
out along with study of cases, surveys and interviews to professionals involved in this area. As a result, a methodology for diagnosis
and improvement was proposed and tested in selected projects. The results obtained show that the main problem of procurement is
related to schedule delays and lack of specified quality for the project. To prevent this situation it is often necessary to dedicate
important resources like money, personnel, time, etc. To monitor and control the process. A great potential for improvement was
detected if state of the art technologies such as, electronic mail, electronic data interchange (EDI), and analysis were applied to the
procurement process. These helped to eliminate the root causes for many types of problems that were detected.
Managing drought short term strategies in semi arid regions a case studyeSAT Journals
Abstract
Drought management needs multidisciplinary action. Interdisciplinary efforts among the experts in various fields of the droughts
prone areas are helpful to achieve tangible and permanent solution for this recurring problem. The Gulbarga district having the total
area around 16, 240 sq.km, and accounts 8.45 per cent of the Karnataka state area. The district has been situated with latitude 17º 19'
60" North and longitude of 76 º 49' 60" east. The district is situated entirely on the Deccan plateau positioned at a height of 300 to
750 m above MSL. Sub-tropical, semi-arid type is one among the drought prone districts of Karnataka State. The drought
management is very important for a district like Gulbarga. In this paper various short term strategies are discussed to mitigate the
drought condition in the district.
Keywords: Drought, South-West monsoon, Semi-Arid, Rainfall, Strategies etc.
Life cycle cost analysis of overlay for an urban road in bangaloreeSAT Journals
Abstract
Pavements are subjected to severe condition of stresses and weathering effects from the day they are constructed and opened to traffic
mainly due to its fatigue behavior and environmental effects. Therefore, pavement rehabilitation is one of the most important
components of entire road systems. This paper highlights the design of concrete pavement with added mono fibers like polypropylene,
steel and hybrid fibres for a widened portion of existing concrete pavement and various overlay alternatives for an existing
bituminous pavement in an urban road in Bangalore. Along with this, Life cycle cost analyses at these sections are done by Net
Present Value (NPV) method to identify the most feasible option. The results show that though the initial cost of construction of
concrete overlay is high, over a period of time it prove to be better than the bituminous overlay considering the whole life cycle cost.
The economic analysis also indicates that, out of the three fibre options, hybrid reinforced concrete would be economical without
compromising the performance of the pavement.
Keywords: - Fatigue, Life cycle cost analysis, Net Present Value method, Overlay, Rehabilitation
Laboratory studies of dense bituminous mixes ii with reclaimed asphalt materialseSAT Journals
Abstract
The issue of growing demand on our nation’s roadways over that past couple of decades, decreasing budgetary funds, and the need to
provide a safe, efficient, and cost effective roadway system has led to a dramatic increase in the need to rehabilitate our existing
pavements and the issue of building sustainable road infrastructure in India. With these emergency of the mentioned needs and this
are today’s burning issue and has become the purpose of the study.
In the present study, the samples of existing bituminous layer materials were collected from NH-48(Devahalli to Hassan) site.The
mixtures were designed by Marshall Method as per Asphalt institute (MS-II) at 20% and 30% Reclaimed Asphalt Pavement (RAP).
RAP material was blended with virgin aggregate such that all specimens tested for the, Dense Bituminous Macadam-II (DBM-II)
gradation as per Ministry of Roads, Transport, and Highways (MoRT&H) and cost analysis were carried out to know the economics.
Laboratory results and analysis showed the use of recycled materials showed significant variability in Marshall Stability, and the
variability increased with the increase in RAP content. The saving can be realized from utilization of recycled materials as per the
methodology, the reduction in the total cost is 19%, 30%, comparing with the virgin mixes.
Keywords: Reclaimed Asphalt Pavement, Marshall Stability, MS-II, Dense Bituminous Macadam-II
Laboratory investigation of expansive soil stabilized with natural inorganic ...eSAT Journals
Abstract
Soil stabilization has proven to be one of the oldest techniques to improve the soil properties. Literature review conducted revealed
that uses of natural inorganic stabilizers are found to be one of the best options for soil stabilization. In this regard an attempt has
been made to evaluate the influence of RBI-81 stabilizer on properties of black cotton soil through laboratory investigations. Black
cotton soil with varying percentages of RBI-81 viz., 0, 0.5, 1, 1.5, 2, and 2.5 percent were studied for moisture density relationships
and strength behaviour of soils. Also the effect of curing period was evaluated as literature review clearly emphasized the strength
gain of soils stabilized with RBI-81 over a period of time. The results obtained shows that the unconfined compressive strength of
specimens treated with RBI-81 increased approximately by 250% for a curing period of 28 days as compared to virgin soil. Further
the CBR value improved approximately by 400%. The studies indicated an increasing trend for soil strength behaviour with
increasing percentage of RBI-81 suggesting its potential applications in soil stabilization.
Influence of reinforcement on the behavior of hollow concrete block masonry p...eSAT Journals
Abstract
Reinforced masonry was developed to exploit the strength potential of masonry and to solve its lack of tensile strength. Experimental
and analytical studies have been carried out to investigate the effect of reinforcement on the behavior of hollow concrete block
masonry prisms under compression and to predict ultimate failure compressive strength. In the numerical program, three dimensional
non-linear finite elements (FE) model based on the micro-modeling approach is developed for both unreinforced and reinforced
masonry prisms using ANSYS (14.5). The proposed FE model uses multi-linear stress-strain relationships to model the non-linear
behavior of hollow concrete block, mortar, and grout. Willam-Warnke’s five parameter failure theory has been adopted to model the
failure of masonry materials. The comparison of the numerical and experimental results indicates that the FE models can successfully
capture the highly nonlinear behavior of the physical specimens and accurately predict their strength and failure mechanisms.
Keywords: Structural masonry, Hollow concrete block prism, grout, Compression failure, Finite element method,
Numerical modeling.
Influence of compaction energy on soil stabilized with chemical stabilizereSAT Journals
Abstract
Increase in traffic along with heavier magnitude of wheel loads cause rapid deterioration in pavements. There is a need to improve
density, strength of soil subgrade and other pavement layers. In this study an attempt is made to improve the properties of locally
available loamy soil using twin approaches viz., i) increasing the compaction of soil and ii) treating the soil with chemical stabilizer.
Laboratory studies are carried out on both untreated and treated soil samples compacted by different compaction efforts. Studies
show that increase in compaction effort results in increase in density of soil. However in soil treated with chemical stabilizer, rate of
increase in density is not significant. The soil treated with chemical stabilizer exhibits improvement in both strength and performance
properties.
Keywords: compaction, density, subgradestabilization, resilient modulus
Geographical information system (gis) for water resources managementeSAT Journals
Abstract
Water resources projects are inherited with overlapping and at times conflicting objectives. These projects are often of varied sizes
ranging from major projects with command areas of millions of hectares to very small projects implemented at the local level. Thus,
in all these projects there is seldom proper coordination which is essential for ensuring collective sustainability.
Integrated watershed development and management is the accepted answer but in turn requires a comprehensive framework that can
enable planning process involving all the stakeholders at different levels and scales is compulsory. Such a unified hydrological
framework is essential to evaluate the cause and effect of all the proposed actions within the drainage basins.
The present paper describes a hydrological framework developed in the form of a Hydrologic Information System (HIS) which is
intended to meet the specific information needs of the various line departments of a typical State connected with water related aspects.
The HIS consist of a hydrologic information database coupled with tools for collating primary and secondary data and tools for
analyzing and visualizing the data and information. The HIS also incorporates hydrological model base for indirect assessment of
various entities of water balance in space and time. The framework would be maintained and updated to reflect fully the most
accurate ground truth data and the infrastructure requirements for planning and management.
Keywords: Hydrological Information System (HIS); WebGIS; Data Model; Web Mapping Services
Forest type mapping of bidar forest division, karnataka using geoinformatics ...eSAT Journals
Abstract
The study demonstrate the potentiality of satellite remote sensing technique for the generation of baseline information on forest types
including tree plantation details in Bidar forest division, Karnataka covering an area of 5814.60Sq.Kms. The Total Area of Bidar
forest division is 5814Sq.Kms analysis of the satellite data in the study area reveals that about 84% of the total area is Covered by
crop land, 1.778% of the area is covered by dry deciduous forest, 1.38 % of mixed plantation, which is very threatening to the
environmental stability of the forest, future plantation site has been mapped. With the use of latest Geo-informatics technology proper
and exact condition of the trees can be observed and necessary precautions can be taken for future plantation works in an appropriate
manner
Keywords:-RS, GIS, GPS, Forest Type, Tree Plantation
Factors influencing compressive strength of geopolymer concreteeSAT Journals
Abstract
To study effects of several factors on the properties of fly ash based geopolymer concrete on the compressive strength and also the
cost comparison with the normal concrete. The test variables were molarities of sodium hydroxide(NaOH) 8M,14M and 16M, ratio of
NaOH to sodium silicate (Na2SiO3) 1, 1.5, 2 and 2.5, alkaline liquid to fly ash ratio 0.35 and 0.40 and replacement of water in
Na2SiO3 solution by 10%, 20% and 30% were used in the present study. The test results indicated that the highest compressive
strength 54 MPa was observed for 16M of NaOH, ratio of NaOH to Na2SiO3 2.5 and alkaline liquid to fly ash ratio of 0.35. Lowest
compressive strength of 27 MPa was observed for 8M of NaOH, ratio of NaOH to Na2SiO3 is 1 and alkaline liquid to fly ash ratio of
0.40. Alkaline liquid to fly ash ratio of 0.35, water replacement of 10% and 30% for 8 and 16 molarity of NaOH and has resulted in
compressive strength of 36 MPa and 20 MPa respectively. Superplasticiser dosage of 2 % by weight of fly ash has given higher
strength in all cases.
Keywords: compressive strength, alkaline liquid, fly ash
Experimental investigation on circular hollow steel columns in filled with li...eSAT Journals
Abstract
Composite Circular hollow Steel tubes with and without GFRP infill for three different grades of Light weight concrete are tested for
ultimate load capacity and axial shortening , under Cyclic loading. Steel tubes are compared for different lengths, cross sections and
thickness. Specimens were tested separately after adopting Taguchi’s L9 (Latin Squares) Orthogonal array in order to save the initial
experimental cost on number of specimens and experimental duration. Analysis was carried out using ANN (Artificial Neural
Network) technique with the assistance of Mini Tab- a statistical soft tool. Comparison for predicted, experimental & ANN output is
obtained from linear regression plots. From this research study, it can be concluded that *Cross sectional area of steel tube has most
significant effect on ultimate load carrying capacity, *as length of steel tube increased- load carrying capacity decreased & *ANN
modeling predicted acceptable results. Thus ANN tool can be utilized for predicting ultimate load carrying capacity for composite
columns.
Keywords: Light weight concrete, GFRP, Artificial Neural Network, Linear Regression, Back propagation, orthogonal
Array, Latin Squares
Experimental behavior of circular hsscfrc filled steel tubular columns under ...eSAT Journals
Abstract
This paper presents an outlook on experimental behavior and a comparison with predicted formula on the behaviour of circular
concentrically loaded self-consolidating fibre reinforced concrete filled steel tube columns (HSSCFRC). Forty-five specimens were
tested. The main parameters varied in the tests are: (1) percentage of fiber (2) tube diameter or width to wall thickness ratio (D/t
from 15 to 25) (3) L/d ratio from 2.97 to 7.04 the results from these predictions were compared with the experimental data. The
experimental results) were also validated in this study.
Keywords: Self-compacting concrete; Concrete-filled steel tube; axial load behavior; Ultimate capacity.
Evaluation of punching shear in flat slabseSAT Journals
Abstract
Flat-slab construction has been widely used in construction today because of many advantages that it offers. The basic philosophy in
the design of flat slab is to consider only gravity forces; this method ignores the effect of punching shear due to unbalanced moments
at the slab column junction which is critical. An attempt has been made to generate generalized design sheets which accounts both
punching shear due to gravity loads and unbalanced moments for cases (a) interior column; (b) edge column (bending perpendicular
to shorter edge); (c) edge column (bending parallel to shorter edge); (d) corner column. These design sheets are prepared as per
codal provisions of IS 456-2000. These design sheets will be helpful in calculating the shear reinforcement to be provided at the
critical section which is ignored in many design offices. Apart from its usefulness in evaluating punching shear and the necessary
shear reinforcement, the design sheets developed will enable the designer to fix the depth of flat slab during the initial phase of the
design.
Keywords: Flat slabs, punching shear, unbalanced moment.
Evaluation of performance of intake tower dam for recent earthquake in indiaeSAT Journals
Abstract
Intake towers are typically tall, hollow, reinforced concrete structures and form entrance to reservoir outlet works. A parametric
study on dynamic behavior of circular cylindrical towers can be carried out to study the effect of depth of submergence, wall thickness
and slenderness ratio, and also effect on tower considering dynamic analysis for time history function of different soil condition and
by Goyal and Chopra accounting interaction effects of added hydrodynamic mass of surrounding and inside water in intake tower of
dam
Key words: Hydrodynamic mass, Depth of submergence, Reservoir, Time history analysis,
Evaluation of operational efficiency of urban road network using travel time ...eSAT Journals
Abstract
Efficiency of the road network system is analyzed by travel time reliability measures. The study overlooks on an important measure of
travel time reliability and prioritizing Tiruchirappalli road network. Traffic volume and travel time were collected using license plate
matching method. Travel time measures were estimated from average travel time and 95th travel time. Effect of non-motorized vehicle
on efficiency of road system was evaluated. Relation between buffer time index and traffic volume was created. Travel time model has
been developed and travel time measure was validated. Then service quality of road sections in network were graded based on
travel time reliability measures.
Keywords: Buffer Time Index (BTI); Average Travel Time (ATT); Travel Time Reliability (TTR); Buffer Time (BT).
Estimation of surface runoff in nallur amanikere watershed using scs cn methodeSAT Journals
Abstract
The development of watershed aims at productive utilization of all the available natural resources in the entire area extending from
ridge line to stream outlet. The per capita availability of land for cultivation has been decreasing over the years. Therefore, water and
the related land resources must be developed, utilized and managed in an integrated and comprehensive manner. Remote sensing and
GIS techniques are being increasingly used for planning, management and development of natural resources. The study area, Nallur
Amanikere watershed geographically lies between 110 38’ and 110 52’ N latitude and 760 30’ and 760 50’ E longitude with an area of
415.68 Sq. km. The thematic layers such as land use/land cover and soil maps were derived from remotely sensed data and overlayed
through ArcGIS software to assign the curve number on polygon wise. The daily rainfall data of six rain gauge stations in and around
the watershed (2001-2011) was used to estimate the daily runoff from the watershed using Soil Conservation Service - Curve Number
(SCS-CN) method. The runoff estimated from the SCS-CN model was then used to know the variation of runoff potential with different
land use/land cover and with different soil conditions.
Keywords: Watershed, Nallur watershed, Surface runoff, Rainfall-Runoff, SCS-CN, Remote Sensing, GIS.
Estimation of morphometric parameters and runoff using rs & gis techniqueseSAT Journals
Abstract
Land and water are the two vital natural resources, the optimal management of these resources with minimum adverse environmental
impact are essential not only for sustainable development but also for human survival. Satellite remote sensing with geographic
information system has a pragmatic approach to map and generate spatial input layers of predicting response behavior and yield of
watershed. Hence, in the present study an attempt has been made to understand the hydrological process of the catchment at the
watershed level by drawing the inferences from moprhometric analysis and runoff. The study area chosen for the present study is
Yagachi catchment situated in Chickamaglur and Hassan district lies geographically at a longitude 75⁰52’08.77”E and
13⁰10’50.77”N latitude. It covers an area of 559.493 Sq.km. Morphometric analysis is carried out to estimate morphometric
parameters at Micro-watershed to understand the hydrological response of the catchment at the Micro-watershed level. Daily runoff
is estimated using USDA SCS curve number model for a period of 10 years from 2001 to 2010. The rainfall runoff relationship of the
study shows there is a positive correlation.
Keywords: morphometric analysis, runoff, remote sensing and GIS, SCS - method
-
Effect of variation of plastic hinge length on the results of non linear anal...eSAT Journals
Abstract The nonlinear Static procedure also well known as pushover analysis is method where in monotonically increasing loads are applied to the structure till the structure is unable to resist any further load. It is a popular tool for seismic performance evaluation of existing and new structures. In literature lot of research has been carried out on conventional pushover analysis and after knowing deficiency efforts have been made to improve it. But actual test results to verify the analytically obtained pushover results are rarely available. It has been found that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. Initial study is carried out by considering user defined hinge properties and default hinge length. Attempt is being made to assess the variation of pushover analysis results by considering user defined hinge properties and various hinge length formulations available in literature and results compared with experimentally obtained results based on test carried out on a G+2 storied RCC framed structure. For the present study two geometric models viz bare frame and rigid frame model is considered and it is found that the results of pushover analysis are very sensitive to geometric model and hinge length adopted. Keywords: Pushover analysis, Base shear, Displacement, hinge length, moment curvature analysis
Effect of use of recycled materials on indirect tensile strength of asphalt c...eSAT Journals
Abstract
Depletion of natural resources and aggregate quarries for the road construction is a serious problem to procure materials. Hence
recycling or reuse of material is beneficial. On emphasizing development in sustainable construction in the present era, recycling of
asphalt pavements is one of the effective and proven rehabilitation processes. For the laboratory investigations reclaimed asphalt
pavement (RAP) from NH-4 and crumb rubber modified binder (CRMB-55) was used. Foundry waste was used as a replacement to
conventional filler. Laboratory tests were conducted on asphalt concrete mixes with 30, 40, 50, and 60 percent replacement with RAP.
These test results were compared with conventional mixes and asphalt concrete mixes with complete binder extracted RAP
aggregates. Mix design was carried out by Marshall Method. The Marshall Tests indicated highest stability values for asphalt
concrete (AC) mixes with 60% RAP. The optimum binder content (OBC) decreased with increased in RAP in AC mixes. The Indirect
Tensile Strength (ITS) for AC mixes with RAP also was found to be higher when compared to conventional AC mixes at 300C.
Keywords: Reclaimed asphalt pavement, Foundry waste, Recycling, Marshall Stability, Indirect tensile strength.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Top 10 Oil and Gas Projects in Saudi Arabia 2024.pdf
Design procedure of an electrohydraulic drive
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 242
DESIGN PROCEDURE OF AN ELECTROHYDRAULIC DRIVE
Srishti Sharma1
, Ramesh R. Lekurwale2
, Amith Masade3
1
Department of Mechanical Engineering, K. J Somaiya College of Engineering, Mumbai, Maharashtra, India
2
Department of Mechanical Engineering, K. J Somaiya College of Engineering, Mumbai, Maharashtra, India
3
Manager, Product & Technology Development Centre, Heavy Engineering, Larsen & Toubro Ltd, Mumbai,
Maharashtra, India
Abstract
Aerodynamicists use wind tunnel to test models as well as for proposed aircraft components and engines. In order to keep these
models fixed in place for testing, ground based equipment is essential. Electrohydraulic drives form the back bone of such type of
mechanism which requires continuous motion for life time operations with controlled motion for start stop and bi-directional
motion mechanisms. Focus of this paper is on systematic approach for optimal designing of a typical electrohydraulic drive that
will provide roll motion to the testing model with emphasis on reliability of the system. This paper further highlights the design,
selection, testing and qualification procedures of different elements of the drive and the electrohydraulic drive assembly as a
whole.
Keywords - Design, Develop, Electrohydraulic roll drive, Spindle.
--------------------------------------------------------------------***------------------------------------------------------------------
1. INTRODUCTION
The modern technology and ever demanding need for the
design of newer means to test models in wind tunnel has led
to significant developments in the area. With the increase in
demand of large appendage deployment and several tracking
mechanisms; the application of electrohydraulic drives has
increased exponentially. Hydraulic servo systems can
generate high forces also exhibit rapid responses, and have a
high power-to-weight ratio compared to other technologies.
On the other hand, they have a significant nonlinear
behavior due to the nonlinear flow/pressure characteristics,
oil compressibility, time varying behavior, nonlinear
transmission effects, flow forces acting on spool and
friction, which is not only largely uncertain but is greatly
influenced by external load disturbances. Hydraulic systems
are mechanically “stiffer”, resulting in higher machine
frame resonant frequencies for a given power, high loop
gain and improved dynamic performance. They also have
the benefit of being self-cooled since the driving fluid
effectively acts as a cooling medium carrying heat away
from the actuator and flow control components [1]. Quality
and reliability aspects are of prime importance at each stage
[2]. Every component whether designed or selected is
checked for various aspects related to the requirement and
chosen such that the complete design is compact and
accurate. The roll drive is very important from aerodynamic
testing point of view as well as to hold the model in correct
and steady position for testing at various roll ranges.
2. PROBLEM DEFINITION
The paper discusses design of a roll drive that would roll at
a specific rate and for a specific roll range by overcoming
the aerodynamic forces and moments acting on the roll
drive. In order to design a roll drive the various mechanical
and electrical devices conceptualized are the sting, pod,
motor/actuators, bearings, feedback devices, hydraulic
cylinders, servo valves, seals, retainers, bolts, etc. Motors,
Bearings, feedback devices, valves, cylinders, seals and
bolts are the standard parts and were studied in depth with
the various classifications and types to choose the best as
per our requirement. There is a five axis manipulator with
Horizontal, Vertical, Yaw, Pitch & Roll motions. The
aerodynamic loads and moments act on the face of the roll
drive and can be seen as below:
Table 1: Aerodynamic Forces and Moments acting on the
Roll drive.
Forces/Moments Symbol Unit
Normal Force Fn N
Axial Force Fa N
Side Force Fs N
Pitching Moment Mp Nm
Yawing Moment My Nm
Rolling Moment Mr Nm
Accuracy of the roll required is ±0.05 degrees or better. The
roll range is of -90⁰ to +90⁰, whereas the roll rate is 0-25
rad/sec at variable rate.
3. DESIGN & DEVELOPMENT
3.1 Motors/Actuators
The very first system required to conceptualize the roll drive
is a motor/actuator. There were three concepts that were
realized to achieve this type of motion namely (a) Direct
2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 243
Electric drive (b) Gearbox with Electric Drive (c) Gearbox
with Hydraulic Drive.
(a) Direct Electric Drive: There exist various electric
drives but there are specifically three drives that are
used for aerospace related applications [2] and can be
listed as :
Brush DC motors
Brushless DC motors
Stepper or Servo motors
Based on the comparison between the drives and
advantages of the servo motor for the need of the
application we choose the Servo Motor from make
such as Moog or Rexroth to fulfill the space
requirements, torque and size parameters.
(b) Gearbox with Electric Drive: The limitation with the
direct drive is the bulkiness of the servo motor due to
which a gearbox was conceptualized with a motor of
lesser torque value such as Parker gearbox & motor kit,
or any other to reduce the size of the motor and fulfill
the torque characteristics.
(c) Gearbox with Hydraulic Drive: an alternative for an
electric drive is a hydraulic drive option which is
explored with a planetary helical gearbox. One may
choose Dan Foss hydraulic motor with a Parker
Gearbox to fulfill the functional requirements.
To choose the best available option for the drive a decision
matrix was made on the basis of few engineering parameters
[3] and can be seen as in the table below:
Table 2: Decision Matrix
PARAMETERS
DIRECT
ELECTRI
C DRIVE
ELECTRI
C DRIVE
WITH
GEARBO
X
HYDRAULI
C DRIVE
WITH
GEARBOX
FUNCTIONAL
REQUIREMEN
T
2 2 2
OPERATIONA
L SAFETY
2 2 2
EASE OF
ASSEMBLY/
DISASSEMBL
Y
2 1 0
RELIABLITY 2 2 2
FEASIBLITY 2 2 2
ACCURACY 2 1 1
PROCUREMEN
T
0 1 2
COST 0 1 1
AESTHETICS 2 1 0
WEIGHT 0 1 1
SPACE
REQUIRED
0 1 2
OIL LEAK IN
VACUUM
2 2 0
EMI/EMC 0 0 2
TOTAL 16 17 17
Weightage: 0-Undesirable, 1-Desirable, 2-Most Desirable
Although there is an equal score of option (b) & (c) we
choose the option (c) due to EMI/EMC issues [4] with the
electric motor and the sensors and force balances that will
be attached on the prototype for testing. A Rotary Hydraulic
Actuator which incorporates many quality features including
precision ball bearings to provide shaft support, externally
removable gland for ease of seal replacement and cylinders
honed to a 10 micro inch finish to ensure long seal life
giving the required torque specifications at feasible pressure
values is selected.
3.2 Bearings
The selection of bearings and sizing the model according to
the specifications is of importance in order to balance the
forces and the moments. The classification of bearings can
be seen as below [5]:
Table 3: Characteristics table for choosing Bearings
Bearing
Type
Radia
l Load
Axial
Load
Accuracy
Low
Noise
Low
Frictio
n
Deep
Groove
Ball
Bearing
s
Good
Nor
mal
Normal
Very
Good
Very
Good
Crosse
d Roller
Bearing
s
Very
Good
Very
Good
Good Good
Very
Good
Cylindr
ical
roller
bearing
s
Very
Good
Good Good
Suffi
cient
Good
Taper
Roller
Bearing
s
Very
Good
Very
Good
Sufficien
t
Good Good
Spheric
al
Roller
Bearing
s
Very
Good
Good
Unsuitabl
e
Suffi
cient
Good
From the above table, choosing crossed roller bearings since
it is good with respect to all the parameters and is suitable
for our application. These bearings will be extremely critical
in the application to take the entire thrust load. In the Cross-
Roller Ring, cylindrical rollers are arranged crosswise, with
each roller perpendicular to the adjacent roller, in a 90⁰ V
groove, separated from each other by a spacer retainer. This
design allows just one bearing to receive loads in all
3. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 244
directions including, radial, axial and moment loads. Since
the Cross-Roller Ring achieves high rigidity despite the
minimum possible dimensions of the inner and outer rings,
it is optimal for applications such as joints and swivelling
units of industrial robots, swivelling tables of machining
centres etc. [6]. Crossed roller bearing was chosen for the
assembly in order to fix one end of the assembly (transfers
the thrust forces to the bottom or to the whole assembly) and
the other end fixed to the spindle such that it is free to rotate
and provide the desired angular motion. To support these
bearings we use radial ball bearings on the other end.
Crossed Roller bearings and radial ball bearings are
preloaded during manufacturing itself, pre-load values for
various rigidity levels are available in catalogue, and no
adjustment is possible during assembly unlike angular
contact bearings.
3.3 Load Calculations & Model Generation
One important standard part extremely critical in the
application because of the high speed, high temperature flow
region is a seal ( to avoid fluid leakage in environment and
from drying the bearings out of lubrication), U-Cup type of
seal has a maximum pressure range up to 40 MPa and would
be suitable for the design. Other non-standard part used is
the flange placed so that all the cables from prototype
sensors and force balances can be taken out from this flange
out to the main console for result evaluation. Standard bolts
selected according to the stress analysis on the assembly.
The assembly was then analyzed for loads & moments
acting on center of axis of the roll drive. Since the forces are
non-coplanar, vector mechanics is used to solve the forces
and moments in the three planes and a resultant used to
calculate the maximum value on the sting. The sting is taken
into consideration and loads and moments applied since it is
the rotating critical member of the assembly. Reactions on
the points where the bearings are placed are calculated using
simple engineering mechanics. Of the three planes yaw &
pitch planes are considered for force calculations, and
making shear force & bending moment diagrams for each
plane [7]. Now the forces and moments on each point on the
two planes are summed up using vector mechanics. With the
shear forces and bending moments now combined at each
point on the spindle, weakest section of the member is taken
and designed for failure.
With the load ratings of the bearings from respective bearing
catalogs, Basic life and Safety factor of the bearings is
calculated for optimum performance of the bearings without
failure during operation. The CAD model was designed
using SEIMENS PLM software NX 7.5. The cross section
of the complete assembly can be seen as below with the
details of the various parts.
Fig 1: Cut sectional view of the Assembly
3.4 Feedback Devices
In order to determine the true position of the output shaft of
the electrohydraulic drive, a position sensor is required.
There are several types of position sensors available and
each has its own merit and demerits [2]. They can be listed
as below:
Table 4: Characteristics table for choosing Position Sensor
Description Resolver Optical
Encoder
Rotary
Potentiomet
er
Accuracy High High Moderate
Reliability Very High High Moderate
Availability All Sizes All Sizes All Sizes
Cost High Moderate low
4. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 245
Principal selection criteria for selection of Position sensors
are the accuracy requirements. Once the accuracy
requirements are established the type of position sensor is
selected based on ease of operation and cost. Thus, choosing
Absolute encoders with hollow shaft mounting having
number of turns of 24 bits having an SSI interface.
4. HYDRAULIC SERVO SYSTEM
A typical hydraulic servo system will have the following sub
systems and can be named as below:
1) Hydraulic Power Supply
2) Servo Valve
3) Hydraulic Actuator
4) Encoder
5) Servo Controller
From the above mentioned sub systems, hydraulic actuator
and encoder has already been discussed. The block diagram
to explain the system can be seen below:
Fig 2: Block diagram of a position controlled Hydraulic
Servo system
4.1 Servo Valve
There are two most important parameters on which the
selection & sizing of a servo valves [8] depends:
(a) Flow Requirement
Specified or Desired Actuator Speed
Limits by Pump flow
(b) Dynamic performance
Acceleration
Cycle time
Accuracy
The electro-hydraulic flow control valve acts as a high gain
electrical to hydraulic transducer, the input to which is an
electrical voltage or current, and the output a variable flow
of oil. The vast majority of flow control servo valves in
existence employ a double flapper nozzle pilot stage and a
single spool boost stage. A stiff feedback spring is generally
used to provide feedback from the boost stage to the pilot.
These types of servo valves tend to be difficult to
manufacture and expensive. A less conventional, less costly
type of flow control servo valve utilizes a two-spool boost
stage and a flapper nozzle pressure control pilot. Because a
feedback wire between the nozzle flapper pilot and the boost
stage is not needed, assembly is simplified [1]. In order to
size a servo valve its flow capacity should be calculated
with the actuator specifications so that it is not oversized or
undersized thereby reducing the system accuracy. An excel
sheet is made on these lines to size the servo valve whose
rated flow is estimated.
The servo valve with the complete system to produce a roll
motion can be seen as in the Simulink model:
5. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 246
Fig 3: Simulink model of the Electrohydraulic Roll drive
The Simulink model is a design of the servo valve with the
pump, motor and the hydraulic fluid used in the system. A
position sensor or encoder detects the position of the Sting.
A Simulink model prepared using a servo valve with the
specifications from calculations and assumptions is as seen
below: The graph shows the output angles or the motion
profile of the rotary actuator:
Fig 4: Angular displacement of rotary actuator
The above motion profile gives 280º of rotation in the
stipulated time, thus achieving the desired motion. The
hydraulic forces acting on the ports of the servo valve can be
as seen below:
Fig 5: Hydraulic Forces on the valve ports.
6. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 04 Issue: 06 | June-2015, Available @ http://www.ijret.org 247
Thus the system operates typically with the desired angular
motion and the forces under permissible value. Therefore
the designed system follows a procedure that can be used to
design various such sub systems in robotic analysis and
research in order to achieve the desired motion.
5. CONCLUSION
1) This paper provides details of the criteria to be studied
during the selection of various standard components to
design an electro hydraulic system with the load
conditions and accuracy requirements.
2) The parameters to be considered for choosing an
electric or hydraulic drive are also summarised and the
block diagram for the complete position control of the
system is listed.
3) The paper includes the mathematical model of the
system in SIMULINK using MATLAB with a servo
valve for the controlled roll motion as well as the
output graphs of the desired angular position.
ACKNOWLEDGEMENTS
We are highly grateful to Prof. Sangeeta Bansode, K.J.
Somaiya College of Engineering and Mr. Arun
Ramchandani & Mr. Mahesh Verma, of HEIC, Larsen &
Toubro Ltd, Powai for giving the opportunity to carry out
our project and we acknowledge their help in reviewing the
Paper. We would like to express our gratitude to other
faculty members of Mechanical Engineering Department of
KJSCE, family and friends for providing academic inputs,
guidance and encouragement throughout this period.
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